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POWPF DrawingVisual performance on some machines
 

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    <p>I am developing an application which needs to draw around 70k rectangles in form of a grid (one grid 40x250 and one 250x250). Not all rectangles will be visible on a screen at the time.</p> <p>After reading <a href="http://msdn.microsoft.com/en-us/magazine/dd483292.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/magazine/dd483292.aspx</a> I created simple control (inherits from FrameworkElement, parts are listed below) which uses DrawingVisual descant to create one column of rectangles.</p> <pre class="lang-cs prettyprint-override"><code>// Removing items after collection change private void RemoveItems(IList oldItems) { foreach (var oldItem in oldItems) { var visualChild = _visuals.FirstOrDefault(v =&gt; v.Data == oldItem); if (visualChild != null) { _visuals.Remove(visualChild); RemoveVisualChild(visualChild); } _translateTransform.X -= 8; } } // Adding items after collection change private void AddItems(IList newItems) { foreach (var newItem in newItems) { var newArray = (byte[]) newItem; var visual = CreateVisual(newArray); _visuals.Add(visual); AddVisualChild(visual); _col++; } } // Creating visual element private StripeVisual CreateVisual(byte[] data) { var result = new StripeVisual { Data = data, Transform = _translateTransform }; using (var dc = result.RenderOpen()) { for (int i = 0; i &lt; data.Length; i++) { dc.DrawRectangle(_brushes[data[i]], _strokePen, new Rect(_col * 8, i * 20, 8, 20)); } } return result; } </code></pre> <p>All brushes are frozen (members of <code>Brushes</code> class) and <code>_strokePen</code> is frozen. New vertical stripe is added to collection every 200ms.</p> <p>Program has been run on 3 computers:</p> <ol> <li>Notebook: i7-2670QM, GeForce GT 540M/Intel HD Graphics 3000, 4GB RAM, Win7 x64, DirectX11,</li> <li>PC: Core2Duo E7400, Radeon HD 4800, 3GB RAM, Win7 x64, DirectX11,</li> <li>PC: i3 3,07GHz, Inter HD Graphics, 3.3GB RAM, Win7 x86, DirectX11.</li> </ol> <p>The problem is that on my first computer program runs smoothly and without big impact on CPU (usage between 1-10%). On both second and third computers programs performance is unacceptable: with about 30x100 grid it takes up to 50% of processor and everything runs very slow. Program runs slowly even when only small part of grid is visible.</p> <p>It looks like program is using software rendering (rendering thread is using 50% of processor), but <code>RenderCapability.Tier >> 16</code> returns 2, and <code>RenderOption.ProcessRenderMode</code> is set to <code>Default</code>. Also there is no key in <code>[HKCU/Software/Microsoft/Avalon.Graphics]</code> that would disable hardware acceleration.</p> <p>Is it possible to run this application smoothly listed computers? What else can I do to maximize performance of this program?</p> <h1>Update</h1> <p>Setting <code>DrawingVisual.CacheMode = new BitmapCache();</code> helped a lot. Does it mean that CPU&lt;=>GPU communication was the bottleneck?</p>
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